Motor controller



C. W. YERGER MOTOR CONTROLLER Filed Dec. 18, 1918 PatentedApr. 24, 1923.

Wi D? P flrricpa.

cHAnL n-s W. ynnen'n, or "wnsnrne-rong DIS-rarer orcoLnM-BIA; nssreivon ro rim 8 Linen CUTLER-Hammer." More co; orimwnnnnn, WISCONSIN, A coa-ronn'rrorr' or WISCONSIN.

.- MOTOR CONTROLLERJ Application filedDecember 16, 1918? ,SerialNo; 267,308;

To all wltomit may concern Be its-known that 1, CHARLES. W. .YERGER,

a citizen of-theUriitedStates, residing. at

followingis a .full-,.cle ar-, concise, and'exact, description,.referencetbemg had to I the aci companying. drawing; forming apart of this specification.

This. invention relates to v motor control lei-s and more particularly to controllers for associated motor; driven mechanisms adapted to-co-operate; cyclically, otyvhich class of'mechanismsrolling mill hotbeds may be taken as exemplary.

In the operation of certain -types' of .hot-

:. bedit is customary to .deliverthe'finished shapes tothe center of the ghotbed and to provided tier. their, further disposition and distribution, and. the present invention contemplates the provisionof a controller for renderingthe action-ofthe alfo-resaid or other similarly correlated instrumentalities fully automation v v 2 A- further object is .that'ofproviding a controller of :the character stated wherein provision is madefor'renderingall or certain of such instrumentalities either active or inactiveat will. 1,

further object is of the character stated operable for effecting operation of either side of the hotbed to the exclusion'of the other side and. to provide remote control means: for supplementing the automatic control under such conditions of operation. 1

A still @further object is that ofprovidingl a controller of the: aforesaid character wherein provision is" made for the substan tially uniform disposition of the shapesor' materials to behandled irrespective vof 'variat-ions in certain oflthe physical cha-racteristics thereof. 5

Other objects andadvantages will hereinafter appear. i In the accompanying drawing. wherein is illustrated an embodiment of the in'ven-.'

tion,

a trigger mechanism slv-e shapes to the SlllG-SGOtlOIlSQfilld 3 alterto provide a controller Figure lis aschematic illustration ofa typical hotbed arrangement, vvhile,,

Fig.2,is a diagrammatic illustration of,

the control mechanism.

Referring -.to\Figure l, the features ofthe generally, at--1 -and.-a pair: of similar side sections- 22and3. The center section in cludesia set of rolls lliiO receivethe finished shapes fromthe rolling mill, to gether with] nately, the latter: being. provided respectively withl shiftlbars 6 and 7 forqmoving the shapes outwardly T from one notch of either side section" to the next. The aforesaid 1 mechanisms are separately driven g through suitable gearing, by threev motors; providemeansfor shifting: successiveshapes p to opposite sides of the hotbed, means being namely a smallmotorS for operatingwthe for shifting gsuccestriggermechanism and la-rge :niotors 9 and 10 for operating therespective shift bars} The driving connections for the respective motors include countershafts 11, '12 and" 13 respectively provided with cams 14,. 1 5 a and 16..

The cam 14 co-oper-ates directly with" the triggerimechanism and is arranged toeffect one completeoperationthereof in either :di

rection; for each half I turn: of Y the counter shaft, the succeeding halfrevolution ofsa id shaftetl'ecting similar'but reverse actuation of-said trigger mechanism, while the cams;

15 and 16 are adapted upon each complete:

revolution thereof to effect bothzoperation oftheir respective shift bars and return thereof to initial position. i

A; plurality;- of drum controllers acting in response to varying hotbed conditions, servein conjunctionvvith other controlelements to 'be hereinafter, described,' for controlling the several motors to prov de cyclic operation of the hotbed'mechanisms both individually and collectively. i

The aforesaid drum controllers include; an oscillatable starting master controller 1'? biased to apredetermined circuitclosing position and movable therefrom to a dilferent circuit closing positionby each of the successively arriving shapesi prior to full delivery thereof'to the center'rolls 4;, a conllltl troller 18 to be rotated by motor 8 from counter shaft 11 at the speed of the latter,

and controllers 19 and 20 driven respectively by large motors 9 and 10 through gearing of such ratio as to provide one-half revolution of each of said controllers for each complete revolution of the respective counter shafts 12 and 13.

The operating means for the master controller 17 include an oscillatable apron 21 to be lifted by each of the successively arriving shapes to be handled, and to be released for biased return movement as each successive shape arrives fully upon thecenter rolls, the circuit connections controlled by said master controller being such as to require both lifting of said apron and return thereof to its biased position in order to initiate the cycle of operation of the hotbed.

As illustrated in Fig. 1, the shift bar 7 is at rest and the trigger mechanism is also at rest after shifting the last delivered shape to the side section 3, while the shift bar 6 is just completing the operation of moving further to the right the shapes previously delivered to section 2. The next shape is still in transit between the rolling mill and the center rolls, the apron 21 being maintained in elevated position thereby. As the end of said shape clears said apron the latter resumes its biased position, thus completing the double operation of the master controller 17 for starting the small motor 8 to shift said shape to the first notch of section 2 of the hotbed. Upon completion of such opera tion the small motor is automatically stopped by the controller 18 which also serves in the interim to provide for starting of the large motor 10 to actuate the shift bar 7 for moving the shapes upon section 3 farther to the left, stopping of motors 9 and 10 upon completion of the operation thereof being of fected automatically by their respective controllers 19 and 20.

Referring now to Figure 2, the motors 8, 9 and 10 are of similar construction differing only in size and power. Said motors are supplied with current from line L through electro-responsive main switches 22, 23 and 24 respectively and are respectively provided with series fields 25, 26 and 27 and with one or more steps of starting resistance 28. 59 and 30. said resistances being respectively controlled by means of suitable lockout switches :31, 32 and 33. Said motors are furthermore provided with dynamic braking circuits controlled respectively by means of electro-responsive switches 34. 35 and 36 biased to circuit closing position and each having an opening winding connected in parallel with the main switch closing winding of its associated motor to provide for simultaneous and opposite action of the switches controlling any motor upon closure or interruption of a single joint energizing circuit.

The joint energizing circuit of the main and dynamic braking switches of motor 9 is adapted to be controlled through either one of a pair of similar relays 39, 40; the corresponding circuit for motor 10 is similarly controllable by means of relays 41, 42; while for motor 8 the corresponding circuit is controllable through similar relays37, 38 supplemented by the contacts a of master controller 17 in a manner and for purposes here inafter stated.

The contacts 6 of said master controller are adapted to make temporary connections for the energizing circuit of relays 37 and 38 jointly to one supply line, each of said relays being provided With auxiliary contacts adapted when the relay is closed to maintain its said line connection, While the contacts 0 and (Z of controller 18 serve to control the connection of said circuits selectively to the other supply line.

The arrangement of said contacts a and (i connected. This action provides for stopping of motor 8 upon completion of one operation of the trigger in either direction;

Moreover, said contacts a and d overlap one another at either end as illustrated, thereby insuring that for any position of the drum the winding of one relay at least is connected with line L while for certain positions of the drum both relay windings are so connected. This arrangement insures that irrespective of the position in which the motor 8 and controller 18 may be stopped, the latter always provides for restarting of the former through suitable actuation of master controller 17, and also provides for continuous operation of the motor under certain conditions.

The contacts 6 ofthe controller 18 co-operate with controller 19 to provide similar control of relays 39 and 40 and the contacts f of controller 18 act similarly in conjunction with controller 20 to determine the action of relays 41 and 42, thus providing similar cyclicoperation of motors 9 and 10 and the respective shift bars 6 and 7 driven thereby.

From the foregoing, it'is apparent that cyclic operation of the individual sections of the hotbed is effected by means of the drum controllers respectively driven thereby, whereas thecontrollerlS serves additionally to co-ordinate the cycles of said individual sections for providing cyclic operation of the hotbed as a whole, said controller acting, during each operation of the trigger'mechanism, to initiate action of the shift bar on that side of the hotbed to which the lastpreceding shape was moved by said The power circuits of the three motors are precisely similar while the control circuits thereof are also in general similar, except for their manner of connection with the various drum controllers.

'Upon closure of main switch22 of motor 8 and opening of its dynamic braking switch 34 the circuit of said motor is completed, said circuit being from line L by conductor 49 through the upper contacts of said main switch, thence, by conductors 50 and 51 through said motorby conductors 52 and 53 through the lower contactso't said main switch,by conductor 5% through series field 25, thence by conductor 55 through the windings of lockout switch 31, by conductor 59 through series resistance 28 to line L As the startingqcurrent decreases due to motor acceleration the lookout switch 31 responds, 'short-circuiting resistance 28 and its own lockout winding in a well known manner, the motor circuit thereafter. extending through said switch andby conductor 60 to line L Uponopeni-ng of-the main switch 22 and closing of dynamic bra-king switch 34 the dynamic braking circuit of said'moto'r is completed, said circuit being from the right hand brush of the motor by conductors 52 and 53 through the lower contacts of switch" 34', thence by conductor 61 through series field 25, by conductor 54 through the upper contacts of switch 3s! and thence by conductors 50 and 51 to the left hand motor brush. The powercircuits off-motors 9 and.

10 being similar to theforeg oingwill not specifically-traced herein.

The fin'ishedshape inits travel from the rolling mill to thecenter rolls 4 "first engages and lifts the apron2l,thereby moving the master controller 17 to the position illustrated for causingengagement of its contacts Z). Such action completesthe ener-v gizing circuit of relay 3?, said circuit extending from line L through stop push button 46, thence by conductors and 63 through the upper contacts Z) of said master controller, by conductor 64 through the Windingof relay 3?,"thence by conductor 65 through contacts 0 of controller 18 and by conductor 66 to. line LHSaid relay there' upon responds and maintains itself through circuit connections independent of master controller 17, said maintainingcircuit ex tending'iirom stop push button 46 by' conductors 62 and 67. through the auxiliary, contactsfiot said relay, thence by conductor 64; through tlie winding' of said relay-and to line L as iori'nerly traced. Closure 'o't' said relay however, does 'not cause starting of motor 8,"suchaction being", dependent upon return of master controller 17 tofits normal position, which occurs up'o-n passage otthe shape trom"benea-th the apronfil. Assuming such movement-of said apron and said controller 'the joint energizing circuit-j of ina-in switch 22; and d namic braking" switchfie is completechsaid ircuiteXtend-y ing from line'L by conductors 49 and"68 thro-ughrelay 37 which is now closed, thence by conductors 69 andmthrough contacts a the junction of conductor 'ZQ therewith, thence by parallel conductzn s"71 and '72 through the windings oi said main switch and said dynamic braking switch and by conductors T3, 74;-and SGtolineL y Said" main switch thereupon closes and said d'y namic braking switch opens thus comip agthe power circuit of motor 8 as already traced: Closure o-t'main switch 22 also ct master controller 17, y'conductor 'Tl'to I y serves to complete a maintaining"circuit tor 75 through the windings of said main T and dynamic brakin'g switches and to -"line 'L 'as formerly traced. liflotor 8 thereafter operatesto drive the trigger mechanism for shifting theishz pe to-the right; W X

The driving connection betweeirsaid motor and the cont'rolletlS is suchthat upon" full movement of thetingger mechanism to the right, said controller'operates to interrupt the maintaining circuit r'e'llayf37I which thereupon opens and in'terruptsthe 115,

maintaining circuits of main switch 22fai1d dynamic braking sw tch 34 for stopping anrl dynamic braking of the motor.

However, priorto such de energization o l relay 37, the controller 18 acts'to connect thewinding ot relay 38'with line L asp reviously described to provide for restarting; oft motor 8 through subsequent cl'osure of saidrelav upon operation of master controller 17 by the next arriving shape.

Also, practically at the. inception of the aforede'scribed trigger operation, thencon:

trollerg18 by means of its contact f, causesf' starting oi motor 10 through'energizatlon oi relay 41, thereby causingeoperation of shift-bar 7 of-the hotbed. Howeven since the shift bar 6 driven by motor 9 is illusbetween the arrival of successive shapes trated as in operation with its control circuits in operative relation, such circuits of the latter motor only'will be considered, the control circuits of these two motors being similar.

The energizing circuit of relay 40 control: ling the motor 9 extends from line L by conductors 7 6 and 77 through contacts 6 of controller 18, thence by conductor 78 through the winding of relay 40, by conductor 7 9 through the lower contacts of controller 19 and thence by conductors 80 and 81 to line L Said relay thereupon closes and maintains itself by circuit connections extending from line L through stop push vbutton l'T-thence by conductor 82 through the auxiliary contacts of said relay, by conductor 78 through the winding of said relay and thence to line L as last traced. Closure of said relay completes the joint energizing circuit of main switch 23 and dynamic braking switch 35, said circuit extending by Conductors 76 and 86 through said relay, thence by conductors 87 and 88 to the junction of conductor 89 with the latter, thence in parallel through the windings of said switches and by conductors 90, 91, 80 and 81 to line L Since from inspection of Fig. 2 it is obvious that the starting push switch circuits for the individual motors merely parallel the corresponding automatically controlled circuits, whereas each' stop push switch is arranged, upon opening, to interrupt the maintaining circuit connection of both of its associated relays with results as aforede scribed, further discussion of these circuits is deemed unnecessary.

It is also obvious that both relays of the several pairs perform precisely similar functions and are energized through parallel circuits, selection between the relays of each pair being determined solely by the posi tioning of the respective controllers, the contacts of said controllers being arranged to insure establishment of return circuit connections for the relay which is open prior to interruption of the return circuitof the relay which is closed; This arrangement, as regards motors 9 and 10, provides for operation of each counter-shaft through a complete revolution and permits the use of a single controller to effect stopping of each motor always at the same position while providing for restarting from said position.

As applied to the motor 8, the afore-described arrangement of the two relays, in conjunction with the overlapped relation of the lower contacts of controller 18 and the double throw characteristic of master controller 17, additionally serves to insure operation of the device, and particularly the trigger mechanism, in complete cycles in respective of variations in the time element upon the center rolls, such variations being likely to occur particularly during the handling of shapes of varying lengths.

Thus if any time the apron 21 is lifted and held. up by an arriving shape before the trigger mechanism has completed its movement for disposal of the preceding shape, the relay which is open will close as soon as controller 18 reaches its lap position and will remain closed without in any wise affecting the operation then in progress, whereas upon subsequent release and descent of said apron the circuit through said relay is com pleted, thereby restartingor continuing the operation of motor 8 for driving the trigger mechanism in the reverse direction.

\Vhile the afore-described features of the controller thus serve to compensate for variations in length oi": the shapes to be handled, it is obvious that the swinging apron 21 is adapted to operate uniformly irrespective of wide variations in the height or thickness f such shapes, whereas variations in lateral vidth of shapes within the capacity of the center rolls in no wise affects the operation ot the controller.

Should it be desired to operate only one side of the hotbed, the stop button controlling the operating motor for the opposite side of the bed is locked in open position, thus insuring against operation thereof. Tlherealter following operation of the motor 8 to shift the finished shape to the active side 01. the hotbed the operating motor for that section is automatically started by means of controller 18 as aforedescribed. However, prior to the arr'val of the next shape upon the center rolls the motor 8 must be started manually for returning the trigger mechanism to its former position and also provid return of the controller 18 to a. position insuring subsequent starting of the large motor which has last operated.

It is, of course, to be understood that the dynamic braking means disclosed here'ni might be supplemented by other braking means desired and that other types of motors more readily controllable for dynamic brakin might be employed in lieu of the series motors illustrated. Also, it is to be understood that the master controller might be operated in other ways and that the timing action thereof with reference to the arrival of successive shapes upon the center rolls might be varied to meet requirements.

What I claim as new and desire to secure by Letters of Patent is:

1. In a controller for motor driven handling devices, in combination, means providing for cyclic operations of the controlled device including motor control means subiect to control through independent sets of instrumentalities, said sets being adapted to participate successively in the control and 2. In acontrollerfor a rolling mill hotbed having a plurality of sections operable by separate motors, the combination with motor control means providing for cyclic operation of the several sections both individually and collectively for disposal of the shapes delivered thereto, of means for timing the initiation of such cyclic action with reference to the time of delivery or each successive shape to the hotbed.

. 3. In a controller for a rolling mill hotbed having a purality otsections operable by separatemotors, the combination with motor control meaiis providing forcyclic' operation of the several sections comprising limit switches to be driveniii synchronism withthe'respective sections to provide for starting and stoppingof each section uniformlyat. a given point, of control means to be driven in synchronism with one of sa d sections for co-ordinating the cycles otfthe other sections sequentially with respect .to

r the cycles ofsaid foriner section, and means to act automatically for timing the starting of said former section with reference to the moment of full delivery to the hotbed of each successive shape to be handled.

4. In a controller for a rolling mill hotbed having 'aplurality o-f sections operable by separate motors, the combination with motor starting means, of means providing for cyclic: operation of the several sections, said latter means including individual controllers for the motors, each of said controllers comprising sets of relatively movable co-' operating contacts the contacts of each set being adapted to disengage one another upon completion of a predetermined range of operation of the section controlled thereby for terminating the cycle thereof, and to ire-engage one another during: a subsequent cycle to provide for initiation of a later cycle by said starting means. the control 01 each section shitting progressively from one to another set of contacts of its associated controller.

5. In a controller for a rolling mill hotbed having a plurality of sections to be driven by separate motors the combination with starting and range limiting means for said sections providing for cyclic operations thereof and including. controllers having iiidividiial starting switches and limit switches for the several inotorsg'of niech'anicalcon' nectionsihet'ween certain otsaid switches for correlating the. cyclesj'of, said-,;'sections "to. i

provide cyclic operation of the v several sections tor progressive acti'on'thereof uponthe successive shapes to he handled thereby,

6. Ini'a controllerfor a rollingm'i'll hotbed having. a plurality of sections ,to befdriyen by separate motors, the combination? with starting and range limiting means for saidsections providing ffor cyclic operations tliereofcomprising controllers to'be driven in synchronism w'ith'th'e'respective sections and I including; lnCllVlClHZtl RlOtOl starting switches;

and limit switches. of means con'nectingcertain of said starting. switches ;with certain of the limit switches so driven for correlate ing the cycles of said sections for 'progrea 1 s ve action .thereof .uponthe successive shapes to handled thereby; and means for actuating another of said starting switches automatically upon delivery ofefa ch shape to the hotbed.

7 7 In a controller forrolling inill hotbeds having a pluralityof sections'to be driven by separate motorsfthe coinbination with starting and rangel miting'ineans;for said sections providing for cyclic operatioiithere 0t and including individual startingswitches .1

for the motors and limit switches to e driven in synchronis'in 'witli'fthe respective sections, each limit' switch ncluding. a plurality of setsl ot relatively movable matters, I each set'o f contacts beingiadapted to coop crate for'controllin'g the action ofits asso- 0 ciated section throughout 'one cyclic Loperation, such control shifting from one set of contacts to another. set. dur ng each cyclic operation to provide for .initiationof the tions of said'sections to provide for progres-f sive action thereof upon the successive shapes to be handled thereby.

8. In a controller for a rolling mill hotbed havinga central section and a pair of 1 similar side sections, said sections to be driven by separate motors. the combination with limit switches to be driven in synchronisin with the respective sections. for stopping of each after a predetermined opera tion andto provide for restarting thereof "from the position ofstopping. of. an auto,- matic starting switch'for said central section to be actuated bythe successively arrive ing shapes to be handled, and separate switches for the respective side sections each to be driven in synchronism with saidsce'n tral section to provide for starting of said side sections alternately and each after one complete operation of'said central section.

9. In a cont-roller for motor driven con veyors, the combination with independent sets of circuitconnections adapt d to pro.-

vide selectively for control of the motor circuit, of a'controller for said connections including a plurality of contacts to be driven in synchronism with-the controlled device and adapted to interrupt one set of said connections to elfect stopping or said device upon. operation thereof to a predetermined degree, and prior to such stopping to preselect another set of said connections to provide for restarting, and independent means to act upon said sets of connections jointly for com letin the connections )reselected lect another set of said connections to provide for restarting, and independent means tO 2lCt upon said sets o1 connections ointly for completing the preselected connections either before or after interruption of the completed circuit by said controller, to provide respectively for continuous or cyclic operation of the controlled device.

11. In a controller for motor driven con- ,veyors, the combination With independent sets of circuit connections adapted to provide selectively for control of the motor circuit, of a controller for said connections includine' a plurality of contacts to be driven in synchronism with the controlled device and adapted to interrupt one set of said connections to eii'ect stopping of said device upon operation thereof to a predetermined degree, and prior to such stoppingto preselect another set oi? said connections to provide for restarting, and independent means operable either automatically or manually at will to act upon said sets of connections jointly for completing the preselected connections either before or after interruption oi. the completed circuit by said controller, to providerespectively for continuous or cyclic operation of the controlled device.

12. In. a controller for motor driven conveyors, the combination with switches for controlling the circuit of the driving motor directly, of automatic control means for said switches comprising a pair oi relays adapted to ellect similar control of said switches,

a controller to be actuated by the successive shapes delivered to the conveyor for joint CHARLES WV. YERGER.

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